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A kind of continuous production method for preparing fatty acid butyl ester based on biodiesel

A technology of fatty acid butyl ester and biodiesel, which is applied in chemical instruments and methods, preparation of organic compounds, reaction preparation of ester groups and hydroxyl groups, etc., can solve problems such as low utilization rate of butanol, decreased yield, equipment corrosion, etc., and achieves Effects of reducing butanol consumption, reducing rectification energy consumption, and saving costs

Active Publication Date: 2020-12-08
ZHEJIANG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation of fatty acid butyl ester is mainly obtained by transesterification of natural animal and vegetable oils (such as soybean oil, rapeseed oil, peanut oil, etc.) under the catalysis of concentrated sulfuric acid. The use process is easy to cause partial carbonization of raw materials, resulting in darker product color, lower purity, lower yield, complicated post-treatment process, serious equipment corrosion, serious wastewater pollution, etc., which seriously restrict the development of this industry.
Furthermore, the current intermittent production method of fatty acid butyl esters has disadvantages such as low efficiency, high energy consumption, low utilization rate of butanol, unstable product quality, and great safety hazards.

Method used

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  • A kind of continuous production method for preparing fatty acid butyl ester based on biodiesel
  • A kind of continuous production method for preparing fatty acid butyl ester based on biodiesel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The fatty acid methyl ester content distribution of raw material biodiesel is shown in Table 1:

[0033] Table 1 Content table of each fatty acid methyl ester in raw material biodiesel

[0034]

[0035]The raw material biodiesel and sodium methoxide catalyst are mixed at a mass ratio of 1000:5 and then mixed with 2m 3 Feed at the flow rate of / h, the gas-liquid transesterification reaction section is composed of four-stage tower reactors, the temperature of the four-stage tower reactors is controlled at 190°C, and the fresh reactant butanol is respectively charged at 0.8m 3 / h, 0.2m 3 / h, 0.2m 3 / h, 0.6m 3 / h flow rate feed to start the reaction. After the whole production system is stabilized, fresh butanol feed will no longer be maintained in the first three tower reactors, and the first, second and third tower reactors will be switched to recover butanol product feed respectively. , The flow rate of the recovered butanol product passed into the three-stage to...

Embodiment 2

[0041] The fatty acid methyl ester content distribution of the raw material biodiesel is shown in Table 1. The raw material biodiesel and sodium methoxide catalyst are mixed at a mass ratio of 1000:5 and then mixed with 3m 3 / h flow rate feed, the gas-liquid transesterification reaction section is composed of six tower reactors, the temperature of the six tower reactors is controlled at 165 °C, and the fresh reactant butanol is 1.4m 3 / h, 0.5m 3 / h, 0.5m 3 / h, 0.5m 3 / h, 0.5m 3 / h, 0.9m 3 / h flow rate feed to start the reaction. After the entire production system is stabilized, the first five tower reactors will no longer maintain fresh butanol feed, and the first to fifth tower reactors will be switched to recycled butanol product feeds, and the first to fifth The flow rate of the recovered butanol product passed into the fifth-stage tower reactor is maintained at 1.4m 3 / h, 0.5m 3 / h, 0.5m 3 / h, 0.5m 3 / h, 0.5m 3 / h; the sixth stage tower reactor maintains fresh b...

Embodiment 3

[0047] The fatty acid methyl ester content distribution of the raw material biodiesel is shown in Table 1. The raw material biodiesel and sodium methoxide catalyst are mixed at a mass ratio of 1000:5 and then mixed with 1.5m 3 / h flow feed, the gas-liquid transesterification reaction section is composed of eight-stage tower reactors, the temperature of the eight-stage tower reactors is controlled at 130 ° C, and the fresh reactant butanol is divided into 0.6m 3 / h, 0.16m 3 / h, 0.16m 3 / h, 0.16 m 3 / h, 0.16m 3 / h, 0.16 m 3 / h, 0.16m 3 / h, 0.45m 3 / h flow rate feed to start the reaction. After the entire production system is stabilized, fresh butanol feed will no longer be maintained in the first seven tower reactors, and the first to seventh tower reactors will be switched to recycled butanol product feeds. The flow rate of the recovered butanol product passed into the seventh-stage tower reactor was maintained at 0.6 m 3 / h, 0.16 m 3 / h, 0.16m 3 / h, 0.16 m 3 / h, 0....

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Abstract

The invention discloses a continuous production method for preparing fatty acid butyl ester based on biodiesel. N stages of gas-liquid reactors which are sequentially connected in series are used as areaction device; the temperature in each stage of gas-liquid reactor is maintained at a reaction temperature; a reaction mixed solution obtained by mixing raw material biodiesel and a catalyst flowsfrom the first-stage gas-liquid reactor to the n[th]-stage gas-liquid reactor; n strands of butanol are respectively introduced into n stages of gas-liquid reactors to carry out ester exchange reaction with the reaction mixed solution, unreacted butanol and byproduct methanol mixed steam is continuously evaporated out in each stage of gas-liquid reactor, and the evaporated butanol and methanol mixed steam is separated and purified to obtain high-purity methanol and butanol; and a reaction liquid flowing out of the n[th]-stage gas-liquid reactor is posttreated to obtain the fatty acid butyl ester product. The fatty acid butyl ester is continuously produced in a manner of connecting multiple stages of gas-liquid reactors in series, and the production method has the advantages of simple process, safety, high efficiency and capability of continuously producing high-quality fatty acid butyl ester.

Description

technical field [0001] The invention belongs to the technical field of fatty acid butyl ester preparation, in particular to a continuous production method for preparing fatty acid butyl ester based on biodiesel. Background technique [0002] Fatty acid butyl ester is a light yellow transparent oily liquid at room temperature. It is a widely used organic chemical intermediate and can be used as biodiesel, lubricating oil, plasticizer, etc. At present, the preparation of fatty acid butyl ester is mainly obtained by transesterification of natural animal and vegetable oils (such as soybean oil, rapeseed oil, peanut oil, etc.) under the catalysis of concentrated sulfuric acid. The use process can easily cause partial carbonization of raw materials, resulting in darker product color, lower purity, lower yield, complicated post-treatment process, serious equipment corrosion, serious wastewater pollution, etc., which seriously restrict the development of this industry. Furthermore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/24C07C67/03C07C67/54
CPCC07C67/03C07C67/54C07C69/24Y02E50/10
Inventor 聂勇梁晓江吴振宇傅俊红解庆龙谈臻炫吴凤娇卢美贞计建炳
Owner ZHEJIANG UNIV OF TECH
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